You're going to have to take the plunge and try. Does it look like the one I or others have shown? Is the lens module removable like shown? Try to pry it apart carefully as others have found some are not glued as strongly as mine was. At worst, you can buy a new module, or a helmet to scavenge and repair this one for sentimentality. I have tools from my pop that bring back many good memories, so I understand that very well. Try.

Agreed: you need better diagrams and specs of power connections. Most servos are 5v driven and you show the servo vcc connected to the L293 vcc so we can assume 5v, however, you have another undientified barrel jack shown in the pic but no common ground to the micro and L293 + servo.

I think this is great!!!! This process could be used with any type of outer housing. Those who would be in need of a shelter( out of necessity, rather than those wanting a cool hangout) will afford the idiotic sensitivities mentioned in the comments.

Hi, dllewellyn2, man that really acts like the 2 battery symptom. If you sparked a weld, it would( might) darken for a less than second and go clear. I wonder if they used a super cap or the second cell was not expected to expire so not accessible? Could you send me a pic at indigoredster@outlook.com, or if you are adventurous, maybe mail it to me if you want me to try an open it up( but no guarantees that I can fix it ) It sounds like an interesting puzzle.

Did you have 2 batteries in your helmet. Often the one the that drives the contrast of the LCD has almost no drain at all and will show 3V almost forever, but the other 2nd one that controls the sensing circuitry will be drained. Otherwise its either in the control circuit,pot,switch, IR sensors, and maybe the solar cel. I guess that's sorta obvious if it's not working :-)

You really need to add some base resistance 16-100 ohms to keep from frying your audio source. Right now its driving directly into a diode junction short( what the BE junction of an npn looks like as as currently hooked up as load )

Hi Tom, I did just that,and got the largest, but even zooming the pin numbers,refdeses,part numbers are badly pixelated. Can Eagle print to pdf? just add that as a file. Reason is: I want to make some :-)

This is an awesomely done instructable. The hookup and descriptions are dead on and easy to follow. I have an analog version of this that I've used since the mid 80's to help find shorted parts. It was indispensable when I did tour gear for George Thorogood and others back in the day. It located shorted output devices in large audio power amps. Without it, you had to unsolder multiple devices until you found the culprit. In hi power systems the heatsinking makes the old "inject controlled current and see what gets warm" method fails. At Hypercom a new proto build of a pos terminal design had a dead sort. Current limited injection alone didn't show any hot spots. It ended up being a solder splash under a decoupling cap. I will be building this! Thanks!

My high school physics teacher had a big metal pretzel can ( used as an overall vessel for the experiment) with a hole at the bottom edge thought which he ran a 1/2" tube about 4feet in length. The tube went into a small soup can filled with flour. He placed a small lit candle into larger can next to the can with flour. Then he place the lid on the overall vessel can.When he blew into the tube, it would then blow the flour into a dust cloud inside the can which the candle would ignite and POOOOFF, the top of the vessel would blow off and hit the ceiling. cool experiment to get kids attention!!!! Kudos out to Teacher Carl Boyd of Delaware 1979!!!!